Can you provide information about your system, Manufacturer, model, CPU, graphics adapter model and drivers, wireless adapter model and driver version, WiDi software version.
I would be good to check with your PC manufacturer and update the wireless and graphics drivers for your system.
Also, let us know at which point does the connection fail, do you see the Receiver in the computer?, does it let you connect? what errors or warnings do you see in the PC when you try to connect?